diff --git a/sys/dev/usb/serial/uchcom.c b/sys/dev/usb/serial/uchcom.c
index fdc5515fa72..ff1ac8897c9 100644
--- a/sys/dev/usb/serial/uchcom.c
+++ b/sys/dev/usb/serial/uchcom.c
@@ -404,6 +404,7 @@ uchcom_detach(device_t dev)
 	DPRINTFN(11, "\n");
 
 	ucom_detach(&sc->sc_super_ucom, &sc->sc_ucom);
+	usbd_transfer_unsetup(&sc->sc_intr_xfer, 1);
 	usbd_transfer_unsetup(sc->sc_xfer, UCHCOM_N_TRANSFER);
 
 	device_claim_softc(dev);